VOGONS


Reply 241 of 249, by DNSDies

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yeah, tried that. 10 seems to be the best result. It just might be a very noisy video card causing it.
My Alaris Cougar doesn't seem to have it nearly as bad, but it has a higher quality vesa video card with a better ramdac.

Reply 242 of 249, by darry

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DNSDies wrote on 2022-07-06, 04:59:

yeah, tried that. 10 seems to be the best result. It just might be a very noisy video card causing it.

What video card is that ? Is the RAMDAC integrated or external ( socketed or not) ?

Reply 243 of 249, by crazii

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gen_angry wrote on 2022-06-20, 06:45:

I'm also seeing a lot of noisy waves 🙁

I've tried two brand with the same AGxx chip and both have the waves, from my experience, the higher resolution you set, the smaller the waves becomes.

Toshiba Satellite Pro 4300 - YMF744, Savage IX
Toshiba Satellite 2805-S501 - YMF754, GeForce 2Go
IBM Thinkpad A21p - CS4624, Mobility Radeon 128
main: Intel NUC11PHKi7C Phantom Canyon: i7-1165G7 RTX2060 64G 2T760PSDD

Reply 244 of 249, by NyLan

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Received the A300 today !
And....also ordered an OSSC for the sake of science 😆

My Intel SE440BX-2 Intel's website Mirror : Modified to include docs, refs and BIOSes.
Proud owner of a TL866 II
Personal GitHub

Reply 245 of 249, by agent_x007

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NyLan wrote on 2022-06-30, 07:48:

looks like to be something that only converts VGA to Hdmi. I don't see any scaler feature. 😢

I took apart my VC160A some time ago (no analog Audio-In version of VC180A), here's Vogons topic I put them into : LINK

157143230295.png

Reply 246 of 249, by Tom84

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All,

Does anyone have an issue with Extron RGB-HDMI 300A (I got used one, not brand new).

After I turn it on, the LED indicator turns amber instead of green, suggesting that it receives power but cannot see video input.

That is quite weird as the VGA from S3ViRGE (or Voodoo 2) works just fine with the old monitor. I suspect that Extron is faulty, but it would be better to ask you guys as it seems that you are quite experienced (maybe I missed something?).

Many thanks!

Reply 247 of 249, by Pierre32

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Tom84 wrote on 2022-08-14, 23:22:
All, […]
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All,

Does anyone have an issue with Extron RGB-HDMI 300A (I got used one, not brand new).

After I turn it on, the LED indicator turns amber instead of green, suggesting that it receives power but cannot see video input.

That is quite weird as the VGA from S3ViRGE (or Voodoo 2) works just fine with the old monitor. I suspect that Extron is faulty, but it would be better to ask you guys as it seems that you are quite experienced (maybe I missed something?).

Many thanks!

This has triggered the vaguest of memories from when I was playing with mine. I remember there was one machine it just wouldn't play with (which had an onboard VGA output). Do you have another VGA signal you can try it with?

Reply 248 of 249, by Tom84

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Sadly no, I do not have another VGA to try out... for now I just got my first old build based on P55C (circa 1998). I was thinking to buy brand new Startech VGA2HDMIPRO (https://www.amazon.com/StarTech-com-VGA-HDMI- … =dp_ob_title_ce), however this one supports 640X480 so DOS/BIOS may not work, as text mode is 720x400 strictly. For now will stick to old 17" monitor... will look for another scaler...

Reply 249 of 249, by SaxxonPike

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I'm going to share my experience with scalers:

The reason I had issues with 320x200 and 720x400 on cards I used is, the sync timings are 100% identical between those two modes. (At least, according to the VGA spec.) Exact timings were obtained using Datapath cards and RGBEasy API, and this held true for 3dfx, Nvidia and S3 cards at least.

Honestly I have never used a single scaler that knew the difference between the two. Either resolution can look great at a time, but not both at once. And that is due to the nature of the analog video signal: it doesn't have a horizontal resolution. It has timings and a line count. In 320x200 mode, it just repeats each line to make 400.

How LCD monitors can get it somewhat close is beyond me- I'm not sure what magic they use, but you still get scaling artifacts to some degree. I can only guess these devices sample the line at quite a high rate and interpolate the samples. Or there's some kind of funky heuristic that doesn't have anything to do with the VGA spec. Mystery to me.

In the end, I decided just to make 320x200 look good and text mode will forever look like crap. It would otherwise require a manual preset selection each time. Vertical squiggly lines are not avoidable in my capture but only while in text mode.

I use an Extron DVS 605 and turn on rate-matching so that these modes still come through at vsync=70hz, but it can of course output something else up to 120hz if I really need it to. And it even handles my Commodore 64 with both NTSC and PAL chips, something the DVS 304 DVI did not do.

Also have the 300 mentioned earlier and it has worked well for me as a general purpose "I don't want to screw with settings, I just want a picture" scaler, although it too had the aforementioned tradeoff and necessary configuration just for 320x200.

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